20243420434 has 4 divisors (see below), whose sum is σ = 30365130654. Its totient is φ = 10121710216.

The previous prime is 20243420423. The next prime is 20243420521. The reversal of 20243420434 is 43402434202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20154061225 + 89359209 = 141965^2 + 9453^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060855107 + ... + 5060855110.

Almost surely, 2^20243420434 is an apocalyptic number.

20243420434 is a deficient number, since it is larger than the sum of its proper divisors (10121710220).

20243420434 is a wasteful number, since it uses less digits than its factorization.

20243420434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10121710219.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20243420434 its reverse (43402434202), we get a palindrome (63645854636).

The spelling of 20243420434 in words is "twenty billion, two hundred forty-three million, four hundred twenty thousand, four hundred thirty-four".